exercises/ex04/ex04.py

@@ -1,6 +1,4 @@
-#!/usr/bin/env python
 # Exercise 4
-# help arg 
 # 1. Getting help with -help or -h.
 # 2. A least three arguments that are flags, meaning they don’t take an extra
 #    argument but simply putting them on the command line turns something on.

exercises/ex05/ex05.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 5
-# cat command
+# 1. cat command
 
 import argparse
 from pathlib import Path

exercises/ex06/ex06.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 6
-# find command
+# 1. find command
 
 import sys
 import argparse

exercises/ex07/ex07.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 7
-# grep command
+# 1. grep command
 
 import re
 import sys

exercises/ex08/ex08.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 8
-# cut command
+# 1. cut command
 
 import re
 import sys

exercises/ex09/ex09.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 9
-# sed command
+# 1. sed command
 
 import re
 import sys
@@ -8,20 +7,34 @@ import argparse
 from pathlib import Path
 
 
-def parse(expression):
-    try:
-        match = re.fullmatch(r's/(.*)/(.*)/(g{0,1})', expression)
-        count = 0 if match.group(3) == "g" else 1
-        return {
-            "rgx": re.compile(match.group(1)),
-            "rep": match.group(2),
-            "n": count
-        }
-    except Exception:
+def check(expression, exp):
+    error = False
+    if (
+        expression[-1] not in "/g"
+        or exp[0] not in "s"
+        or len(exp) not in range(3, 5)
+        or (expression[-1] in "g" and len(exp) != 4)
+        or (expression[-1] in "/" and len(exp) == 4)
+    ):
+        error = True
+    if error:
         print(f"sed: expresión «{expression}» inválida")
         sys.exit(1)
 
 
+def parse(expression):
+    count = 0
+    exp = list(filter(None, expression.split("/")))
+    check(expression, exp)
+    if len(exp) == 3:
+        count = 1
+    return {
+        "rgx": re.compile(exp[1]),
+        "rep": exp[2],
+        "n": count,
+    }
+
+
 parser = argparse.ArgumentParser()
 parser.add_argument("stream", default=sys.stdin, nargs="*")
 parser.add_argument(

exercises/ex10/ex10.py

@@ -1,6 +1,5 @@
-#!/usr/bin/env python
 # Exercise 10
-# sort command
+# 1. sort command
 
 import sys
 import argparse

exercises/ex11/cut

@@ -1 +0,0 @@
-../ex08/cut

exercises/ex11/sed

@@ -1 +0,0 @@
-../ex09/sed

exercises/ex11/sort

@@ -1 +0,0 @@
-../ex10/sort

exercises/ex11/uniq

@@ -1,37 +0,0 @@
-#!/usr/bin/env python
-# Exercise 11
-# uniq command
-
-import sys
-import argparse
-from pathlib import Path
-
-parser = argparse.ArgumentParser()
-parser.add_argument("stream", default=sys.stdin, nargs="*")
-parser.add_argument("-i", "--ignore-case", action="store_true")
-parser.add_argument("-c", "--count", action="store_true")
-args = parser.parse_args()
-lines = []
-counter = None
-
-for stream in args.stream:
-    if isinstance(args.stream, list):
-        for line in Path(stream).open().readlines():
-            lines.append(line.rstrip())
-    else:
-        lines.append(stream.strip())
-
-if args.ignore_case:
-    lines = list(map(lambda l: l.lower(), lines))
-
-if args.count:
-    counter = {}
-    for line in lines:
-        counter.setdefault(line, 0)
-        counter[line] += 1
-
-lines = sorted(set(lines))
-
-for line in lines:
-    msg = line if counter is None else f"{counter[line]} {line}"
-    print(msg)